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No it is not. 2 is an integer, 7 is a non-zero integer so 2/7 is a ratio of two integers, the second of which is not zero. Therefore, by definition, 2/7 is rational.
If a numerator and/or denominator in a fraction is irrational, the entire fraction is irrational. Since pi is irrational, pi divided by two is also irrational.
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56 divided by 2 = 28 28 divided by 2 = 14 14 divided by 2 = 7 7 cannot be divided by 3, or by 5 7 divided by 7 = 1 Therefore the prime factors of 56 are 2, 2, 2 and 7.
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